Sullair SRL-7.5MB User Manual page 20

02250236-267 R02
Operation (continued)
■ Changeable Pressure Ranges
Pressure
Description
Standard Pressure
Changeable
Pressure Range
Pressure
Description
Standard Pressure
Changeable
Pressure Range
Notes: 1. When operating the air compressor with a pressure bandwidth of 30 psig (2.1 bar), it is recommended that a large size vertical
air receiver is installed.
2. The pressure bandwidth of the maximum pressure and the recovery pressure cannot be lower than 12/15psig (0.8/1.0 bar).
The interval of pressure change is 1psig (0.07 bar).
3. The air compressor may keep running over the maximum pressure of 122psig (8.4 bar)/145psig (10.0 bar) because of the
Start Frequency Protection, even if the maximum pressure is lowered.
■ Cycle Control Logic (CCL): Operation and protection from excessive cycling of the main motors.
● The SRL air compressor measures the "ON-OFF cycle number" during the operation of the compressor
and automatically adjusts the maximum (stop) pressure to prevent the "ON-OFF cycle" from increasing
when the "ON-OFF cycle number" increases. By limiting the "ON-OFF cycle", the SRL air compressor
protects the scroll head, electric motor and electromagnetic contactor (Please see the figure page 17).
● After the CCL adjusts the maximum (stop) pressure, the CCL continues to automatically measure the
"ON-OFF cycle number" and lowers the maximum (stop) pressure within the permissible range of the
"ON-OFF cycle number". When the CCL nears the set maximum (stop) pressure of the air compressor
and the "ON-OFF cycle number" becomes consistent, the air compressor will continue to run at the
new set limits.
● The SRL air compressor is equipped with a protection device to prevent frequent ON-OFF operations.
Start Frequency Protection automatically measures the cycles of ON-OFF, and in the case that the
cycle of ON-OFF is less than 20 seconds, the operation will continue for 20 seconds even if the
maximum pressure setting is lowered. In the event that it takes less than 20 seconds to reach
the standard maximum pressure [122psig (8.4 bar)/145psig (10.0 bar)], the controller will stop the
operation of the air compressor at 122psig (8.4 bar)/145psig (10.0 bar). If this happens 5 times
continuously, it is defined as a「ON-OFF cycle error」. If this occurs,「E.CY」 will be indicated on the
digital display, and the operation of the air compressor will stop to protect the compressor head, electric
motor and electromagnetic contactor.
● Pressing the Stop switch will reset the unit from the「ON-OFF cycle error」, and allow it to restart the
air compressor. However, if the situation which caused the「ON-OFF cycle error」 is not eliminated, the
ON-OFF cycle error」 will occur again.
● To lower the amount of cycles of ON-OFF, the recovery pressure will need to be lowered by following
the procedure for changing the control pressure setting. (Refer to P.15)
If the recovery pressure is already set at its lowest point, a larger air receiver will need to be installed.
122 PSIG Model
Maximum (Stop) Recovery (Start)
Pressure [psig (bar)] Pressure [psig (bar)]
122 (8.4)
122 - 92
(8.4 - 6.3)
145 PSIG Model
Maximum (Stop) Recovery (Start)
Pressure [psig (bar)] Pressure [psig (bar)]
145 (10.0)
145 - 95
(10.0 - 6.6)
Subject to EAR, ECCN EAR99 and related export control restrictions.
Pressure
Bandwidth [psig (bar)]
110 (7.6) 12 (0.8)
110 - 80
12 (0.8)
(7.6 - 5.5)
Pressure
Bandwidth [psig (bar)]
115 (7.9) 30 (2.1)
130 - 80
15 (1.0)
(9.0 - 5.5)
16
Pressure Unit
Interval of Change
-
1 psig (0.07 bar)
Pressure Unit
Interval of Change
-
1 psig (0.07 bar)